PAM8403 3W × 2 Class-D Stereo Amplifier Module with Potentiometer

Product Description

The PAM8403 Amplifier Module is a compact and efficient Class-D stereo audio amplifier designed for portable speakers, robotics, DIY audio systems, and embedded electronics projects. It can deliver up to 3W × 2 output power when operated at 5V with 4Ω speakers.

The module includes a convenient potentiometer knob with integrated power switch, allowing users to adjust audio volume and switch the amplifier on or off without requiring an external control circuit.

High-Efficiency Class-D Amplification

The PAM8403 uses a filter-less Class-D amplifier architecture, allowing speakers to be driven directly while maintaining high efficiency and reducing the need for bulky external output filters.

With efficiency above 90%, the module is well suited for battery-powered applications where reduced power consumption and compact size are important.

Enhanced Power Filtering

The module includes an onboard 470µF filter capacitor to help provide stable power delivery and cleaner audio performance. This makes it suitable for applications such as Bluetooth speakers, robotic voice systems, portable audio devices, and audio upgrades.

Integrated Volume & Power Control

The built-in potentiometer provides convenient manual volume control and includes an On/Off switch. This simplifies installation and reduces the number of external components required.

Key Features

Class-D stereo audio amplifier
3W × 2 output at 5V with 4Ω speakers
High efficiency above 90%
Built-in volume control knob
Integrated On/Off switch
2.5V–5.5V DC operating range
Filter-less amplifier design
470µF onboard power filter capacitor
Compact 30mm × 22mm module
Suitable for portable and battery-powered projects
Low-noise audio amplification

Technical Specifications

Feature	Specification
Model	PAM8403 with Knob
Chip Type	Class-D Stereo Amplifier
Operating Voltage	2.5V – 5.5V DC
Output Power	3W × 2 at 5V / 4Ω
Efficiency	>90%
Controls	Volume Knob + On/Off Switch
Dimensions	30mm × 22mm × 16mm
Filter Capacitor	470µF

Working Principle

The PAM8403 receives a low-level audio input signal and amplifies it using its Class-D switching amplifier architecture. The amplified stereo output is then provided to the connected speakers.

The onboard potentiometer controls the input level, allowing the user to adjust the volume manually.

Typical Application Scenarios

Portable Audio

Ideal for DIY Bluetooth speakers, portable speakers, and compact audio systems.

Robotics

Can provide voice output, sound effects, and audio feedback for robots and embedded systems.

Computing Projects

Suitable for adding amplified audio output to Raspberry Pi, Arduino, and other development projects.

Retrofitting

Useful for upgrading or repairing radios, game consoles, displays, and other small audio devices.

Applications

Bluetooth speakers
Portable audio systems
DIY boomboxes
Robotics
Voice synthesis systems
Arduino audio projects
Raspberry Pi audio projects
LCD and display audio systems
Game console upgrades
Radio repairs
Embedded audio devices
Battery-powered sound systems

Package Includes

1 × PAM8403 Amplifier Module with Potentiometer Knob

Note: Speakers and connecting wires are not included.

Product Disclaimer

Product information provided on our website may not be entirely accurate as specifications can vary between manufacturers, suppliers, and production batches. Please verify the actual product specifications before using the module in critical applications.

Product images are for illustrative purposes only and may differ from the actual product in colour, component placement, knob design, or other visual details.

Important Note

Input Voltage

Do not exceed 5.5V DC input voltage. Applying a higher voltage may permanently damage the PAM8403 amplifier IC.

Polarity

Always verify the positive (+) and negative (-) power connections before powering the module. Reverse polarity may damage the board.

Speaker Compatibility

For the stated 3W × 2 output at 5V, use suitable 4Ω speakers and ensure the speakers are connected correctly.

Cooling

Although the module is highly efficient, proper ventilation is recommended during continuous high-power operation.

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Frequently Asked Questions

1. What is the PAM8403 module?

It is a compact Class-D stereo audio amplifier module designed to amplify audio signals for small speakers.

2. What is its output power?

It can provide up to 3W × 2 at 5V with 4Ω speakers.

3. What voltage does it require?

The module operates from 2.5V to 5.5V DC.

4. Does it have a volume control?

Yes. It includes a built-in potentiometer knob for volume adjustment.

5. Does the knob include a power switch?

Yes. The potentiometer includes an On/Off switch.

6. Can I use it with Arduino?

Yes. It can be used with Arduino and other compatible audio-output projects.

7. Can I use it with Raspberry Pi?

Yes. It can be used to amplify suitable audio output from a Raspberry Pi.

8. Can I use it for Bluetooth speakers?

Yes. It is suitable for DIY Bluetooth speaker projects when connected to a compatible audio source and suitable speakers.

9. What speakers should I use?

For the stated maximum output specification, 4Ω speakers are recommended.

10. Is a speaker included?

No. The package contains only the PAM8403 amplifier module with potentiometer knob.

11. Can I power it with more than 5.5V?

No. Do not exceed 5.5V DC, as this may damage the amplifier.

12. What is the onboard 470µF capacitor for?

It helps provide power filtering and supply stability for the amplifier.

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